Which of the following is a source of chemical weathering that has been exacerbated by air pollution from industrial plants and car emissions?
a. acid rain
b. oxidation of iron
c. formation of clay
d. dissolving of limestone

Consider the classification levels of a human. eukarya ,animalia ,chordata ,mammalia ,primates, hominidae ,homo ,sapiens .which is the most specific taxonomic level in the classification system above? a sapiens b homo c hominidae d primates